"After this interview I'm going to have a nice healthy breakfast," she tells the mag. "I'm on a meal plan, which absolutely sucks -- but on Sundays I get to have a cheat day where I go buck wild and eat In-N-Out Burger."

Perry, who wed Russell Brand, 35, in October, also makes sure to fit workouts into her busy schedule as she preps for her 95-date "California Dreams" tour, which kicks off in Portugal February 20.

"I'll work out, go to a vocal lesson, run through the entire set at rehearsals, go to dance rehearsal until 10:00 p.m. and then go home and sort through e-mails concerning the production," says the star, who trains with pro Harley Pasternak. "I feel like I'm training for the Olympics!"

Well, if the Olympics smelled like junk food.

The "Fireworks" singer, who recently shot a guest appearance on How I Met Your Mother, reveals she's incorporating smell-o-vision to her shows.

"It's the first concert that's going to smell good," she says. "It's going to smell like you're in cotton candy heaven. It's a fun little nuance. I am a woman of detail, and you will be seeing that -- even down to the 15 outfit changes I'm doing in concert."

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